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                [Usaco2008 Open]Cow Cars 奶牛飞车                </h1>
                <p>时间限制：5s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：64MB</p>			</div>
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                                <h3>题目描述</h3><p><div><span style="font-size: medium">&nbsp;&nbsp;编号为1到N的N只奶牛正各自驾着车打算在牛德比亚的高速公路上飞驰．高速公路有M(1&le;M&le;N)条车道．奶牛i有一个自己的车速上限Si(l&le;Si&le;1,000,000)．</span></div>
<div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;在经历过糟糕的驾驶事故之后，奶牛们变得十分小心，避免碰撞的发生．每条车道上，如果某一只奶牛i的前面有K只奶牛驾车行驶，那奶牛i的速度上限就会下降K*D个单位，也就是说，她的速度不会超过Si&nbsp;-&nbsp;kD(O&le;D&le;5000)，当然如果这个数是负的，那她的速度将是0．牛德比亚的高速会路法规定，在高速公路上行驶的车辆时速不得低于/(1&le;L&le;1,000,000)．那么，请你计算有多少奶牛可以在高速公路上行驶呢？</span></div></p><hr/><h3>输入格式</h3><p><div><span style="font-size: medium">第1行输入N，M，D，L四个整数，之后N行每行一个整数输入Si．</span></div>
<div><span style="font-family: Helvetica, 'Microsoft Yahei', verdana; font-size: 14px; line-height: 23px;">N&lt;=50000</span></div></p><hr/><h3>输出格式</h3><p><div>&nbsp;</div>
<div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;输出最多有多少奶牛可以在高速公路上行驶．</span></div></p><hr/><h3>样例输入</h3><pre>3 1 1 5//三头牛开车过一个通道.当一个牛进入通道时，它的速度V会变成V-D*X(X代表在它前面有多少牛),它减速后，速度不能小于L
5
7
5

INPUT DETAILS:

There are three cows with one lane to drive on, a speed decrease
of 1, and a minimum speed limit of 5.

</pre><hr/><h3>样例输出</h3><pre>2

OUTPUT DETAILS:

Two cows are possible, by putting either cow with speed 5 first and the cow
with speed 7 second.

</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>Silver</p>
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